High prevalence of antibodies to the 2009 pandemic influenza A(H1N1) virus in the Norwegian population following a major epidemic and a large vaccination campaign in autumn 2009

K Waalen; A Kilander; S G Dudman; G H Krogh; T Aune; O Hungnes

doi:10.2807/ese.15.31.19633-en

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High prevalence of antibodies to the 2009 pandemic influenza A(H1N1) virus in the Norwegian population following a major epidemic and a large vaccination campaign in autumn 2009
K Waalen¹ , A Kilander¹ , S G Dudman¹ , G H Krogh¹ , T Aune¹ , O Hungnes¹
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Affiliations: ¹ Department of Virology, Norwegian Institute of Public Health, Oslo, Norway

Correspondence:
O Hungnes
olav.hungnes fhi.no
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Citation style for this article: Waalen K, Kilander A, Dudman S G, Krogh G H, Aune T, Hungnes O. High prevalence of antibodies to the 2009 pandemic influenza A(H1N1) virus in the Norwegian population following a major epidemic and a large vaccination campaign in autumn 2009. Euro Surveill. 2010;15(31):pii=19633. https://doi.org/10.2807/ese.15.31.19633-en Received: 30 Jun 2010

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Abstract

The prevalence of antibodies reactive to the 2009 pandemic influenza A(H1N1) was determined in sera collected before the start of the pandemic, during the early phase, and after the main epidemic wave and nationwide vaccination campaign in Norway. A substantial rise in prevalence of antibodies at protective titres, from 3.2% to 44.9%, was observed between August 2009 and January 2010. The highest prevalence, 65.3%, was seen in the age group of 10-19 year-olds.